Crushing-machine



W. G. STEVENSON.

CRUSHING MACHINE.

APPLICATION men OCT. 5, 1918.

Pmmmed July 9 mm.

2 SHEETS-SHEET I.

W. STEVENSON CRUSHIWG MACHINE,

APPLICATION FILED OCT. 5, 191B.

Pmmnfnedl July fl WW.

2 SHEETS-SHEET 2.

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application filed llctober El,

To all whom may concern:

lie it known that l llfinnmrr ti. ld'rnvnrn son, a citizen of the llnited States, and a resident of tlhicago, in the county of Cool; and {rltate of lllinois, have invented certain new and useful linprovenlents in Crushinglltlachines, of which the following is a specification. l

My invention relates to improved crushing machines and covers several improved features of construction, arrangement and operation. Among the important objects of the invention are to produce a simple machine ofsinall size with a large capacity; to prothree a machine which continuous in its (operation, that is, into which raw material can be constantly fed and the crushed or ground inatcrial continuously delivered therefrom; and to provide a construction involving a plurality of concentric crushing or grinding zones and improved mechanism for transferring the material from one zone to the other.

The above and other features of my in vcntion are embodied in a machine shown on the accompanying drawings, in whichfigure 1 is a side elevational view with parts in section and. broken awry Fig. S2: is a plan view with the framework in section on plane 91-52,, big. 1, and

llig. 3 is a diametral sectional view of the grinding table.

The foundation preferably of concrete provided for the machine supporting structure, this foundation forming the pit l'l. liln the ends of the foundatimi are secured the metal supporting bases .12 and 12 respectively, from which. rise the frames 13 and 13 which are sewn-ed together near their upper ends by the horizontally extend ing Ill beams 14land 15. The vertical. shaft in is supported at its lower end in the step hearing it? mounted on the foundation at the lmttonl of the pit 11, the shaft being journaled at its upper end in a bearing frame 18 secured to the beam 1.4-. l raine extensions 1.9 and 19 on the end raines l3 and 13 support bearings for the driving shaft 20 which extends at right angles to the shaft 16 and. carries a driving pinion 21 which meshes with the gear 22 secured to the upper end of the shaft in, the shaft Elli supporting also the belt pulley 23 by ineans of which it rotatedl i l ithin the pit is the crushing and gruujhng table 24:

llpecification of Letters Itetent.

ofthe shaft 16.

ll -atented duly ll,

lldlli. Serial lilo. 256,94l5.

secured by its hub 25 to the shaft 16. it cylindrical sheet metal. outer wall 26 is supported, on the table within the peripheral flange 27 and concentric with. this outer wall and with the hub 25 are the annular partition walls 23, 29 and 30. These intermediate walls together with the hub and outer wall form. the concentric annular crushing troughs 31, 32, 33 and 3d, the grinding plates 35, 86, 37 and 38 presenting a hard grinding surface, being preferably secured to the table to form the bases for the troughs.

Engaging in the trough 31 are the heavy grunting rollers 39 and d0, the rollers being parallel and at opposite sides of the trough, the rollers having the shafts 41 and 42 re- SpUClJ'lVOl'y. rlecured to the beams 1d and. i5 and extending parallel. and downwardly tluu'efroni are the frames a3 and lel: which at their lower ends have the vertically extending rectangular guide ways 45 and 4:6 re spectively for the rectangular bushings 41-7 and to in which the inner ends of the shafts 41:1 and 1-9, respectively are jmlrnaled. lleanos and 54: tor the rectangular bushings 55 and so in which the outer ends of the shafts t1. and 4:2 are journaled the rollers 39 and 10 being thus pivotei l. to revolve and. being bodily shiitable vertiijzally as they travel over material to be orushi-id wl'len. the table 2st is rotated.

For the troughs W, 33 and, 34 two sets of rollers 52', 5h, 59 and 5'7, 58, 59 are provided, the sets being diametrically opposite and. the rollers being at right angles with the rollers 39 and 4h). The rollers of the sets are inilependently rotatable on shafts ill) and 60b, respectively the axes of these shafts being in the plane of the axis 0n the bases 1.2 and 12 are siu iported the bearing frames 61 and (51 which have the vertically extending rectangular bushings 63 and 63 in whichthe outer ends of the shafts (30 and 60' are journaled. The inner ends of these shafts are journaled in rectangular bushings 64-. and 64: slidable vertically inv the guide ways 65 and 65 of the frames 66 and 66 secured against the sides of the frames 43 and a l.

The rollers in the sets are thus free to r0 tate independently on their supporting shafts and the sets can shift bodily vertically as the rollers travel over the material during grinding thereof. A spout 67 extends between the beams 14 and 15 and the frames 43 and 44 for discharging into the inner trough 31 the raw material to be reated, and after a preliminary crushing operation in this trough underneath the rollers 39 and 40 the material is conveyed into the next trough 32 and then successively to the troughs 33 and 34c to be discharged from the trough 34L. Secured to the beam 49 is the fitting 68 to which is pivoted the forked end of the arm 69, which at its inner end has the lateral extension 70 to which is secured the sheet metal scoop 71. This scoop extends over the partition wall 28 and into the trough 31, its inner edge engaging against the trough base so as to receive material from the trough and convey it over the wall 28 into the next trough 32, the scoop sides 72 being shaped to guide the'material and prevent spilling thereof. The arm 69 being hinged at its outer end the scoop edge willalways engage with the floor of the trough 31 to efficiently scoop up the material, any wear on the scoop being thus compensated for.

Secured to the beam 49 is the frame 74 to which are hinged the arms 75, 76 and 77 whose inner ends support the scoops 78, 79 and 80, respectively. The entrance edges ofv these scoops engage with and extend transversely across the floors of the troughs 32, 33 and 34, respectively, to receive material from these troughs. The outer ends of the scoops 78 and 79 extend over the partition walls 29 and 30 respectively, to deliver material to the troughs 38 and 34: respectively, while the scoop 80 at its outer end extends across the outer wall 26 to deliver thelinished product from the machine.

. edges of the scoops will always engage with the trough bottoms. It will also be noted that the scoops are secured to the arms at their outer ends and extend toward the pivoted ends of the arms. This arrangement permits the scoops to ride more easily in the troughs and reduces strains.

7 My improved machine is of very large capaeity in comparison with its size and weight. The material is fed into the inner trough where it is given apreliminary crushing and grinding treatment by the heavy rollers 39 and 40 and is then transferred successively to the outer concentric crushing and grinding zones where it is acted upon by the rollers 57,58, 59and 5.7, 58 and 59, the finished product being delivered from the scoop 80. Owing to the long aggregate length of grinding trough, raw material can be continuously fed into the machine and finished material continually discharged therefrom, the machine operating therefore at maximum efiicieney.

the material treated is moist or sticky, as for example where rock asphalt is being treated, scrapers or scariiiers in the form of rods 81 may be provided for engaging with the floors of the troughs to loosen up and scrape therefrom any material which may stick thereto, upper and lower supporting frames 82 and 83 secured to the beam 50 being provided in which the rods may vertically reciprocate, weights 81 being preferably provided at the upper ends of the rods for urging them down *ardly against the material.

I do not of course desire to be limited to the exact construction and arrangement shown and described as modifications can no doubt be made which would still come within the scope of the invention.

I claim as follows:

1. In a crushing machine of the class described, the combination of the supporting frame work, a horizontal table having a plurality of concentric troughs, means for rotating said table on its axis, crushing rollers engaging said table in the respective troughs, means for feeding material to the inner trough, an arm hinged at one end to said supporting frame work and extending over said table with the direction of travel thereof, a scoop secured near one of its ends to the free end of said arm and extending under said arm and toward the hinged end thereof in a direction opposite to that of rotation of said table, the inner end of said. scoop resting against the bottom of the inner trough and the other end extending over the described, the combination of a horizontal table having a plurality of concentric troughs, means for rotating said table on its vertical axis, crushing rollers engaging said table in the respective troughs, means for feeding material to the inner trough, a supporting frame stationarily secured above said table, a plurality of arms pivoted at one end to said supporting frame and extending over said table one to each of said troughs in a direction corresponding to the direction of rotation of said table, a scoop for each arm secured to the outer end thereof and extending toward the hinged end of said arm in a direction opposite to that of rotation of said table, the inner end of each scoop resting against the bottom of respective trough and the other end extending over the trough rim to the next adj eeent trough whereby material is scooped up from one trough. and discharged into the next trough, said arms being under tension during open otion off the machine and being vertically free to permit the scoop edges to at all times rest against the bottoms of said troughs.

In Witness whereof, I hereunto subscribe 10 my name this 30th day of Eieptember, A. D, 1918.

WILLIAM G. STEVENUN 

